Apple today published a new update for the upcoming iOS 10.3.3 final release. It looks like this will be the latest version of iOS 10, because we'll have iOS 11 in the fall, which is already released in beta for developers.
iOS 10.3.3 Public Beta 4 makes visible changes only for iPad Pro 12.9-inch users who receive a set of Three new wallpapers. The rest is about solving some bugs and other minor security issues.
10.3.3 4 iOS Public Beta is available for download for all iPhone, iPad, and iPot Touch users who have the devices enrolled in the Beta Apple.
A complete tutorial about how we can enroll, download and install a iOS beta on iPhone, iPad and iPod Touch, we find this address.
It is expected that in the near future Apple will make available to the general public and the beta version for the future iOS 11, Which will be released this fall with iPhone 8.